Vista Laptop not being updated although updates exist

[Guest GeoffH]

My Vista PC shows up in WSUS 3.0 and WSUS says it needs 18 updates.

But "Windows Update" reports it is up to date. Checking WSUS by schedule or

by forcing a WSUS check (clicking the "Check for updates") finds no updates.

This is my first Vista machine so I have most likely missed something.

Any ideas please.